So there are no output errors, and my problem is that the tool named "Customized" is not being cloned into the player's backpack if they have this gamepass.
The tool "Customized" is located in ServerStorage.
This is in a regular Script inside ServerScriptService.
game.Players.PlayerAdded:connect(function(player)
player.CharacterAdded:connect(function(character)
if game:GetService("GamePassService"):PlayerHasPass(player, 187979130) then
game.ServerStorage.Customize:Clone().Parent = player:WaitForChild("Backpack")
end
end)
end)

2 comments
Didn't fix it.
That's what my script looks like.